<?php
const ERRMODE_EMPTY = 1;
const ERRMODE_LITERAL = 2;
const ERRMODE_EXCEPTION = 3;
function render_template($template, array $variables, $escapeChar = '@', $errMode = ERRMODE_EXCEPTION) {
$esc = preg_quote($escapeChar);
$expr = "/
$esc$esc(?=$esc*+{)
| $esc{
| {(\w+)}
/x";
$callback = function($match) use($variables, $escapeChar, $errMode) {
switch ($match[0]) {
case $escapeChar . $escapeChar:
return $escapeChar;
case $escapeChar . '{':
return '{';
default:
if (array_key_exists($match[1], $variables)) {
return $variables[$match[1]];
} else if ($errMode === ERRMODE_EMPTY) {
return '';
} else if ($errMode === ERRMODE_LITERAL) {
return $match[0];
} else if ($errMode === ERRMODE_EXCEPTION) {
throw new \Exception('Unknown placeholder: ' . $match[1]);
} else {
return $errMode;
}
}
};
return preg_replace_callback($expr, $callback, $template);
}
$template = <<<'TPL'
HELLO {name}
How are you doing {when}
Feeling @{ok}?
TPL;
$data = [
'name' => 'WORLD',
'when' => 'yesterday',
];
echo render_template($template, $data);
preferences:
40.38 ms | 402 KiB | 5 Q